Entanglement improvement via a quantum scissor in a realistic environment

Abstract

We propose a protocol for improving quantum entanglement based on a quantum scissor scheme [D. T. Pegg, Phys. Rev. Lett. 81, 1604 (1998)PRLTAO0031-900710.1103/PhysRevLett.81.1604]. Compared to existing protocols for entanglement improvement, our scheme does not require biside operation on two-mode squeezed vacuum states. This greatly enhances the success probability as well as entanglement, while reducing the resources. A squared gain factor can be obtained from our scheme. In addition, our scheme is robust against the decoherence when considering more realistic cases. Finally, a comparison between the single-side quantum scissor scheme and the single-side quantum catalysis is also investigated.